Though older, Usenet remains a powerhouse for new video releases. With retention times of over 10 years, users can find sone183 in MP4 format posted within minutes of its source release.
: Content should detail the playback capabilities for both MP3 (audio) and MP4 (video) formats. sone183mp4+new
So refers to a specific DVD/Blu-ray title from S1’s lineup. The “mp4+new” part tells you someone has encoded it to MP4 and is flagging it as a recent addition. Though older, Usenet remains a powerhouse for new